Two-syllable adjectives which end in usually form the comparative by adding and the superlative by adding (note the change of - y to-i in the comparative/superlative). Two-syllable adjectives ending in or-less always form the comparative with more and the superlative with most. As a general rule, most other two- syllable adjectives also form comparatives and superlatives with more and most, apart from those ending in -y (see point 3 above). However, a few two-syllable adjectives can take either -er/-est or more/most. - -er -est -ed, -ing, -ful